Delhi air quality slips into 'severe' category amid dense fog and cold wave

Calm winds and dense fog trap pollutants as seven monitoring stations record 'severe' AQI and 24 of 39 in 'very poor' category

Delhi’s air quality deteriorated sharply once again on Saturday, with Air Quality Index (AQI) slipping back into the ‘very poor’ and ‘severe’ categories after a brief improvement earlier in the week. A thick layer of smog coupled with dense winter fog enveloped large parts of the national capital, triggering health concerns and impacting daily life.

 

Anand Vihar monitoring station recorded an AQI of 410 at 8 am, according to the Central Pollution Control Board (CPCB). Six other stations also reported ‘severe’ pollution levels on Saturday morning.

#WATCH | Delhi | Visuals around the Akshardham area as a layer of smog engulfs the national capital.  AQI (Air Quality Index) around the area is 410, categorised as 'Severe', as claimed by CPCB (Central Pollution Control Board). pic.twitter.com/3OdHGnyHFG

— ANI (@ANI) December 27, 2025

 

Twenty-four of the 39 monitoring stations recorded AQIs in the ‘very poor’ category.

 

The citywide average AQI witnessed a sharp rise, climbing from 305 on Friday to around 400.

 

Why have the AQI gone up again?

 

Experts attributed the spike in pollution to calm wind conditions and falling temperatures, which have prevented the dispersion of pollutants. The stagnant atmosphere has allowed particulate matter to accumulate close to the surface, worsening air quality across the region.

 

Delhi weather outlook

 

For Delhi, the India Meteorological Department (IMD) has issued a yellow alert for Saturday, forecasting a partly cloudy sky with moderate fog at many places and dense fog at isolated locations during morning hours. The IMD has warned that moderate to dense fog is likely to persist over the next two days, followed by shallow to moderate fog during morning hours thereafter.

 

Minimum temperatures are expected to hover between 6 and 8 degrees Celsius, conditions that are likely to further aggravate pollution levels.

 

Health advisory in place

 

Authorities have advised residents to limit outdoor activities, particularly during early morning hours. Children, the elderly and people with respiratory ailments have been urged to take extra precautions as the toxic air continues to pose serious health risks.